Copyright and Generic Entry in Book Publishing
研究了版权对图书可得性和价格的影响，发现1998年版权期限延长法案在未激励新作品创作的情况下，显著降低了消费者剩余，经济上无效率。
Taking works off copyright promotes their availability, but it also allows generic entry to dissipate producer surplus. This paper examines the effect of a copyright on the availability and price of books when incentives to create new works are not affected. Evaluating the welfare impact of the 1998 Copyright Term Extension Act, I find that a copyright significantly limits the availability of works, leading to a decrease in consumer surplus, which is significantly larger than any increases in profits to copyright holders. Without changing incentives to create new content, the copyright extension was economically inefficient.